Jenny has finished 15 of the 20 lessons in her piano book. Liam has finished the same percent of lessons from his piano book. His book contains 40 lessons. How many lessons has Liam finished?
Only 0.1,2,3,4,5,6,7,8,9,-,-, and I are allowed in your answer. Answers that are mixed numbers must be entered as an improper fraction or decimal.